To find $A \cup B$, we need to take the union of sets $A$ and $B$. The union of two sets contains all elements that are in either set, without duplication.

Given:

• $A = \{4, 6, 8\}$
• $B = \{3, 4, 7, 10\}$

The union $A \cup B$ is the set of all elements that appear in either $A$ or $B$:

$A \cup B = \{3, 4, 6, 7, 8, 10\}$

Therefore, the answer is: $3, 4, 6, 7, 8, 10$

Would you like more details on the steps? Also, here are 5 related questions to expand on this:

1. What is the intersection of sets $A$ and $B$?
2. What is the complement of $A$ with respect to $U$?
3. How do you find $A \cap C$?
4. What is $(A \cup B) \cap C$?
5. How would the union change if $B = \{3, 4, 7\}$ instead of $\{3, 4, 7, 10\}$?

Tip: In set theory, the union operation combines all unique elements from two sets.